Lamp base



FIG. 1 is a perspective view of lamp base showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a perspective view of the lamp base in an open condition; and,

FIG. 9 is a perspective view of the lamp base in a closed condition, the broken lines being shown for illustrative purposes only and forming no part of the claimed design. 

The ornamental design for lamp base, as shown and described. 